#region MigraDoc - Creating Documents on the Fly
//
// Authors:
//   Stefan Lange
//   Klaus Potzesny
//   David Stephensen
//
// Copyright (c) 2001-2019 empira Software GmbH, Cologne Area (Germany)
//
// http://www.pdfsharp.com
// http://www.migradoc.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using MigraDoc.DocumentObjectModel.Internals;

namespace MigraDoc.DocumentObjectModel.Fields
{
    /// <summary>
    /// NumericFieldBase serves as a base for Numeric fields, which are: 
    /// NumPagesField, PageField, PageRefField, SectionField, SectionPagesField
    /// </summary>
    public abstract class NumericFieldBase : DocumentObject
    {
        /// <summary>
        /// The valid format strings for the supported numeric types.
        /// </summary>
        protected static string[] ValidFormatStrings =
        {
            "",
            "ROMAN",
            "roman",
            "ALPHABETIC",
            "alphabetic"
        };

        /// <summary>
        /// Initializes a new instance of the NumericFieldBase class.
        /// </summary>
        internal NumericFieldBase()
        { }

        /// <summary>
        /// Initializes a new instance of the NumericFieldBase class with the specified parent.
        /// </summary>
        internal NumericFieldBase(DocumentObject parent) : base(parent) { }

        #region Methods
        /// <summary>
        /// Creates a deep copy of this object.
        /// </summary>
        public new NumericFieldBase Clone()
        {
            return (NumericFieldBase)DeepCopy();
        }

        /// <summary>
        /// Implements the deep copy of the object.
        /// </summary>
        protected override object DeepCopy()
        {
            NumericFieldBase numericFieldBase = (NumericFieldBase)base.DeepCopy();
            return numericFieldBase;
        }
        #endregion

        #region Properties
        /// <summary>
        /// Gets or sets the format of the number.
        /// </summary>
        public string Format
        {
            get { return _format.Value; }
            set
            {
                if (IsValidFormat(value))
                    _format.Value = value;
                else
                    throw new ArgumentException(DomSR.InvalidFieldFormat(value));
            }
        }
        [DV]
        internal NString _format = NString.NullValue;
        #endregion

        /// <summary>
        /// Determines whether the format is valid for numeric fields.
        /// </summary>
        protected bool IsValidFormat(string format)
        {
            foreach (string name in ValidFormatStrings)
            {
                if (name == Format)
                    return true;
            }
            return false;
        }

        /// <summary>
        /// Determines whether this instance is null (not set).
        /// </summary>
        public override bool IsNull()
        {
            return false;
        }
    }
}
